- noun Version 3A (sometimes also 3B) of MUD, from which
most other MUAs are directly descended. Incarnations include
Essex MUD, CompuNet MUD and (as version 3B) BL.
- noun The particular incarnation of MUD1 at Essex
University; the first MUD to be played by externals. It may
sometimes be called MUD-1 by confused people on the Internet.
- noun The MUD1 rooms of MUD2's database.
"I left the cc in MUD1 somewhere". Not always capitalised in this